I would usewhatever you use on whitetails as far the arrow goes. The broadhead, I would go with a good fixed blade like Muzzy or Montecs. Just make sure you are confident you can put it where it needs to be.
I killed a bull in 2005 in Mew Mexico.
Mathews Switchback-70#
Easton axis arrows with Snyper Broadhead
Perfect shot thru both lungs and the arrow stuck in the offside shoulder. He went 150 yards and piled up.
Just make you get the best shape of your life. Those mountains are steep and the air is thin. Don't skimp on your conditioning.
Here is my bull.
